Comparative neurochemical features of the innervation patterns of the gut of the basal actinopterygian,Lepisosteus oculatus,and the euteleost,Clarias batrachus |
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| Authors: | Giacomo Zaccone Eugenia Rita Lauriano Giuseppa Silvestri Christopher Kenaley José M. Icardo Simona Pergolizzi Alessio Alesci Manvendra Sengar Michal Kuciel Anita Gopesh |
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| Affiliation: | 1. Dipartimento di Scienze dell'Ambiente, della Sicurezza, del Territorio, degli Alimenti e della Salute (S.A.S.T.A.S.), University of Messina, Messina, Italy;2. Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA;3. Department of Anatomy and Cell Biology, University of Cantabria, Santander, Spain;4. Department of Zoology, Institute of Basic Sciences, Bundelkhand University, Jhansi, India;5. Department of Comparative Anatomy, Jagiellonian University, Krakow, Poland;6. Department of Zoology, University of Allahabad, Allahabad, India |
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| Abstract: | The structure and physiology of enteric system are very similar in all classes of vertebrates, although they have been investigated only occasionally in non‐mammalian vertebrates. Very little is known about the distribution of the neurotransmitters in the gut of actinopterygian fishes. Anatomical and physiological studies of enteric nervous systems in the spotted gar (Lepisosteus oculatus) and airbreathing catfish (Clarias batrachus), a non‐teleost and teleost actinopterygian, respectively, have not been undertaken. This study provides the first comprehensive characterization of the range of neurochemical coding in the enteric nervous system of these two species, including the chemical diversity of the mucosal endocrine cells in the pyloric stomach of Clarias. Autonomic innervation of the secretory glands is also described and reported herein for the first time for fishes. We also report splanchnic (spinal) innervation of the stomach, submucosal ganglia (that also colocalize with nNOS) and caudal intestine of Clarias. In both fish species, numerous 5HT, ChAT, nNOS and TH‐positive nerve fibres have been observed. These discoveries demonstrate that much more physiological and pharmacological data are needed before a comprehensive model of enteric nervous system control in vertebrates can be developed. |
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| Keywords: | enteric system autonomic innervation submucosa neurotransmitters myenteric ganglia teleost fishes |
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